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CuiYW wrote: | hi, all | I am porting U-boot to custom cpci board (MPC8540 based). On the | board, we use Intel non-transparent PCI-to-PCI bridge 21555 to isolate | MPC8540 from system, and MPC8540 is connected to secondary pci bus of 21555.
We use that chip on our JSE board.
| Because no srom is connected to 21555, we configure 21555 using | mpc8540 (implemented in U-boot).
That's how we do it. Check out the board support files for the JSE board in the U-Boot CVS head.
After system starts up, mpc8540 can | find and access 21555, but system card can not find and configure | it(such as BAR0, BAR1). If we delay booting of system card(boot mpc8540 | firstly), system card can find and configure 21555 successfully. | How to fixthe problem? Could you please give me a hand?
The bridge should initially come up configured so that the host side configuration cycles are retried. Configure the 21555 to your liking, then clear the PCI-Lockout bit. The chip should boot up with the PCI-Lockout bit set. Otherwise, you are stuck.
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